Importing fit or gpx file into FasCat app

I have the fascat app synced with most all of the cycling apps that I use, including TrainerRoad, TrainingPeaks, and Wahoo. Occasionally, I use Rouvy for a workout or virtual ride. Since the app does not sync with Rouvy, how do I get my workout imported into the FasCat app so that it recognizes it as a completed work out for the day? I have the file in both gpx and Fit format.